More from Amazon.com : http://www.amazon.com/gp/product/B0007UQNWC?tag=purrfectcatdi-20 <br /> <br />Celestron 93623 Narrowband Oxygen III 1.25 Filter <br /> <br />For viewing many common nebulas <br />Reduces glare and light scattering <br />Increases contrast through selective filtration <br />Made of high quality solid plane parallel glass with excellent homogeneity <br />Anti-reflection coated to prevent glaring and ghosting
